1. National Energy R&D Center for Nonfood Biomass, Beijing Forestry University , Beijing 100083 , China
2. Key Laboratory for Silviculture and Conservation of the Ministry of Education, Beijing Forestry University , Beijing 100083 , China
3. College of Forestry, Nanjing Forestry University , Nanjing 210037 , China
4. Yuanhua Forestry Biological Technology Co., Ltd. , Sanming, Fujian 650216 , China
5. Hunan Soapberry Agroforestry Development Co., Ltd. , Changde, Hunan 415000 , China
6. Forestry Bureau of Zhenfeng County, Qianxinan Buyi and Miao Autonomous Prefecture , Guizhou Province 562400 , China